title: Enhancing methane production of Chlorella vulgaris via thermochemical pretreatments.
abstract: To enhance the anaerobic digestion of Chlorella vulgaris, thermochemical pretreatments were conducted. All pretreatments markedly improved solubilisation of carbohydrates. Thermal treatments and thermal treatments combined with alkali resulted in 5-fold increase of soluble carbohydrates while thermal treatment with acid addition enhanced by 7-fold. On the other hand, proteins were only solubilized with thermo-alkaline conditions applied. Likewise, all the pretreatments tested improved methane production. Highest anaerobic digestion was accomplished by thermal treatment at 120°C for 40 min without any chemical addition. As a matter of fact, hydrolysis constant rate was doubled under this condition. According to the energetic analysis, energy input was higher than the extra energy gain at the solid concentration employed. Nevertheless, higher biomass organic load pretreatment may be an option to achieve positive energetic balances.
authors.affiliation: IMDEA Energy, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain.
authors.forename: Lara
authors.initials: L
authors.lastname: Mendez
authors.forename: Ahmed
authors.initials: A
authors.lastname: Mahdy
authors.forename: Rudolphus A
authors.initials: RA
authors.lastname: Timmers
authors.forename: Mercedes
authors.initials: M
authors.lastname: Ballesteros
authors.forename: Cristina
authors.initials: C
authors.lastname: González-Fernández
mesh_terms: D000693:Anaerobiosis; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002241:Carbohydrates / Q000032:analysis; D048408:Chlorella vulgaris / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*; D058086:Microalgae / Q000378:metabolism; D009930:Organic Chemicals / Q000032:analysis; D011506:Proteins / Q000032:analysis; D012995:Solubility; D013696:Temperature
chemical_list: D002241:Carbohydrates; D009930:Organic Chemicals; D011506:Proteins; D008697:Methane
keywords: Anaerobic digestion; Chlorella vulgaris; Methane; Microalgae; Pretreatment